linux-kernel - [RFC PATCH 3/6] ALSA: pcm: Check for substream->ops before substream->ops->mmap

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Date:   Wed, 19 May 2021 13:48:39 +0300
From:   Codrin Ciubotariu <codrin.ciubotariu@...rochip.com>
To:     <alsa-devel@...a-project.org>, <linux-kernel@...r.kernel.org>
CC:     <perex@...ex.cz>, <tiwai@...e.com>,
        <pierre-louis.bossart@...ux.intel.com>, <broonie@...nel.org>,
        <joe@...ches.com>, <lgirdwood@...il.com>, <lars@...afoo.de>,
        <kuninori.morimoto.gx@...esas.com>, <nicolas.ferre@...rochip.com>,
        <Cristian.Birsan@...rochip.com>,
        Codrin Ciubotariu <codrin.ciubotariu@...rochip.com>
Subject: [RFC PATCH 3/6] ALSA: pcm: Check for substream->ops before substream->ops->mmap

substreams, like the internal ones, might not have ops set. Check it,
before looking at substream->ops->mmap.

Signed-off-by: Codrin Ciubotariu <codrin.ciubotariu@...rochip.com>
---
 sound/core/pcm_native.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c
index 54e0eab2a57e..cb0164d55593 100644
--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -246,7 +246,7 @@ static bool hw_support_mmap(struct snd_pcm_substream *substream)
 	if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_MMAP))
 		return false;
 
-	if (substream->ops->mmap ||
+	if ((substream->ops && substream->ops->mmap) ||
 	    (substream->dma_buffer.dev.type != SNDRV_DMA_TYPE_DEV &&
 	     substream->dma_buffer.dev.type != SNDRV_DMA_TYPE_DEV_UC))
 		return true;
-- 
2.27.0